AMD

AMD Athlon X4 840

AMD processor specifications and benchmark scores

4
Cores
4
Threads
3.8
GHz Boost
65W
TDP
🔓Unlocked

AMD Athlon X4 840 Specifications

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Athlon X4 840 Core Configuration

Processing cores and threading

The AMD Athlon X4 840 features 4 physical cores and 4 threads, which directly impacts multi-threaded performance in CPU benchmarks. More cores allow the processor to handle parallel workloads efficiently, improving performance in video editing, 3D rendering, and multitasking scenarios. Thread count determines how many simultaneous tasks the CPU can process, with higher thread counts benefiting productivity applications and content creation workflows.

Cores
4
Threads
4
SMP CPUs
1
⏱️

Athlon X4 840 Clock Speeds

Base and boost frequencies

Clock speed is a critical factor in Athlon X4 840 benchmark performance, measured in GHz. The base clock represents the guaranteed operating frequency, while the boost clock indicates maximum single-core performance under optimal conditions. Higher clock speeds translate to faster single-threaded performance, which is essential for gaming and applications that don't fully utilize multiple cores. The Athlon X4 840 by AMD can dynamically adjust its frequency based on workload and thermal headroom.

Base Clock
3.1 GHz
Boost Clock
3.8 GHz
Multiplier
31x 🔓
đź’ľ

AMD's Athlon X4 840 Cache Hierarchy

L1, L2, L3 cache sizes

Cache memory is ultra-fast storage built directly into the Athlon X4 840 processor die. L1 cache provides the fastest access for frequently used data, while L2 and L3 caches offer progressively larger storage with slightly higher latency. Larger cache sizes significantly improve CPU benchmark scores by reducing memory access times. The Athlon X4 840's cache configuration is optimized for both gaming performance and productivity workloads, minimizing data fetch delays during intensive computations.

L1 Cache
256 KB
L2 Cache
4 MB
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Steamroller Architecture & Process

Manufacturing and design details

The AMD Athlon X4 840 is built on AMD's 28 nm manufacturing process, which determines power efficiency and thermal characteristics. Smaller process nodes allow for more transistors in the same space, enabling higher performance per watt. The architecture defines how the processor handles instructions and manages data flow, directly impacting benchmark results across different workload types. Modern CPU architectures like the one in Athlon X4 840 incorporate advanced branch prediction and out-of-order execution for optimal performance.

Architecture
Steamroller
Codename
Kaveri
Process Node
28 nm
Foundry
GlobalFoundries
Transistors
2,411 million
Die Size
245 mm²
Generation
Athlon (Kaveri)
🔢

Steamroller Instruction Set Features

Supported CPU instructions and extensions

The Athlon X4 840 by AMD supports various instruction set extensions that enable optimized performance for specific workloads. SIMD instructions like SSE and AVX accelerate multimedia, scientific computing, and AI workloads by processing multiple data points simultaneously. Features like AES-NI provide hardware-accelerated encryption, while AVX-512 (if supported) enables advanced vector processing for data centers and high-performance computing. These instruction sets are critical for software compatibility and performance in modern applications.

MMX
SSE
SSE2
SSE3
SSSE3
SSE4A
SSE4.1
SSE4.2
AES
AVX
AVX2
FMA3
BMI1
AMD64
AMD-V
🔌

Athlon X4 840 Power & Thermal

TDP and power specifications

The AMD Athlon X4 840 has a TDP (Thermal Design Power) of 65W, indicating the cooling solution required for sustained operation. TDP affects both system power consumption and the type of cooler needed. Lower TDP processors are ideal for compact builds and laptops, while higher TDP chips typically offer better sustained performance in demanding CPU benchmarks. Understanding power requirements helps ensure your system can deliver consistent performance without thermal throttling.

TDP
65W
đź”§

AMD Socket FM2+ Platform & Socket

Compatibility information

The Athlon X4 840 uses the AMD Socket FM2+ socket, which determines motherboard compatibility. Choosing the right platform is essential for building a system around this processor. The socket type also influences available features like PCIe lanes, memory support, and upgrade paths. When comparing CPU benchmarks, ensure you're looking at processors compatible with your existing or planned motherboard to make informed purchasing decisions.

Socket
AMD Socket FM2+
Chipsets
A88X, A85X, A78, A75, A68H
PCIe
Gen 3, 16 Lanes(CPU only)
Package
µPGA
DDR5

AMD Socket FM2+ Memory Support

RAM compatibility and speeds

Memory support specifications for the Athlon X4 840 define which RAM types and speeds are compatible. Faster memory can significantly improve CPU benchmark performance, especially in memory-intensive applications and gaming. The memory controller integrated into the Athlon X4 840 determines maximum supported speeds and channels. Dual-channel or quad-channel memory configurations can double or quadruple memory bandwidth, providing noticeable performance gains in content creation and scientific workloads.

Memory Type
DDR3
Memory Bus
Dual-channel
Memory Bandwidth
34.1 GB/s
📦

Athlon X4 840 Product Information

Release and pricing details

The AMD Athlon X4 840 is manufactured by AMD and represents their commitment to delivering competitive CPU performance. Understanding the release date and pricing helps contextualize benchmark comparisons with other processors from the same generation. Launch pricing provides a baseline for evaluating value, though street prices often differ. Whether you're building a new system or upgrading, the Athlon X4 840 by AMD offers a specific balance of performance, features, and cost within AMD's product lineup.

Manufacturer
AMD
Release Date
Aug 2014
Market
Desktop
Status
End-of-life
Part Number
AD840XYBJABOXAD840XYBI44JA

Athlon X4 840 Benchmark Scores

cinebench_cinebench_r15_multicoreSource

Cinebench R15 multi-core renders a complex 3D scene using all CPU threads simultaneously. This test reveals how AMD Athlon X4 840 performs in parallel rendering workloads.

cinebench_cinebench_r15_multicore #1353 of 1788
285
2%
Max: 14,978
Compare with other CPUs

cinebench_cinebench_r20_multicoreSource

Cinebench R20 multi-core uses a scene requiring 4x more computational power than R15. This test better reflects modern CPU capabilities for professional rendering on AMD Athlon X4 840. The more demanding workload provides better differentiation between current-generation processors. Content creators and 3D artists use this benchmark to estimate real-world render performance.

cinebench_cinebench_r20_multicore #1353 of 1788
1,189
2%
Max: 62,412
Compare with other CPUs

🏆 Top 5 Performers

📍 Nearby Performers

cinebench_cinebench_r20_singlecoreSource

Cinebench R20 single-core tests one thread against a more demanding scene than R15. This reveals the true single-thread rendering capability of AMD Athlon X4 840. The increased complexity provides more accurate performance differentiation between modern CPUs. Single-thread performance remains critical for gaming and applications with serial bottlenecks.

cinebench_cinebench_r20_singlecore #1352 of 1784
168
2%
Max: 8,811
Compare with other CPUs

cinebench_cinebench_r23_multicoreSource

Cinebench R23 multi-core is the current standard for CPU rendering benchmarks with a 10-minute minimum runtime. This extended test reveals sustained performance of AMD Athlon X4 840 after thermal limits kick in. The longer duration exposes cooling limitations that shorter benchmarks miss. Professional users rely on R23 scores to predict real-world rendering performance under sustained workloads.

cinebench_cinebench_r23_multicore #1352 of 1788
2,833
2%
Max: 148,601
Compare with other CPUs

🏆 Top 5 Performers

📍 Nearby Performers

cinebench_cinebench_r23_singlecoreSource

Cinebench R23 single-core measures sustained single-thread performance over 10 minutes. This reveals how AMD Athlon X4 840 maintains boost clocks under continuous load. The extended runtime shows whether thermal throttling affects single-core performance. This score is particularly important for understanding real-world responsiveness beyond initial boost behavior.

cinebench_cinebench_r23_singlecore #1352 of 1788
400
2%
Max: 20,979
Compare with other CPUs

About AMD Athlon X4 840

The AMD Athlon X4 840 delivers a solid baseline for everyday computing. With four physical cores clocked at 3.10 GHz and a boost up to 3.80 GHz, it clears typical office suites, media transcoding, and light content creation without breaking a sweat. Cinebench R23 multi‑core scores hover around 2,833 points, confirming that the silicon can sustain multi‑threaded workloads despite its modest 28 nm process. Power draw stays within a 65 W TDP envelope, meaning cooler operation and quieter fans in compact builds. The chip’s lack of hyper‑threading keeps latency predictable, which is a plus for software that favors core count over thread count. Overall, it sits comfortably between entry‑level CPUs and the higher‑end FX line, offering a reliable workhorse for budget rigs.

AMD's Athlon X4 840 holds its own in the gaming arena when paired with a sensible GPU. At 1080p, titles like Counter‑Strike: Global Offensive and Rocket League run above 60 fps on mid‑range cards, thanks to the 3.80 GHz turbo burst. More demanding engines such as Witcher 3 dip into the low‑90s FPS range, which is acceptable for casual play but not for competitive e‑sports. The processor’s single‑core Cinebench R23 score of 400 points translates to decent frame‑time consistency in CPU‑bound scenarios. However, you’ll feel the pinch in modern titles that lean heavily on multi‑core scaling, where the quad‑core design caps at around 1,200 points in Cinebench R20 multi‑core. Pairing it with a fast DDR3 kit and a modest SSD can shave a few milliseconds off load times, making the experience feel smoother than the raw numbers suggest.

The 840‑series quad‑core offers an attractive price‑to‑performance ratio for builders watching every dollar. On the secondary market, you can often find the chip for under $50, which undercuts many contemporary Intel alternatives in the same price bracket. When you factor in the 65 W TDP, the total system power bill stays low, a benefit for small‑form‑factor or HTPC builds. Its performance per watt outpaces many older FX models, giving you more compute for less heat. The modest benchmark scores mean you won’t be able to push ultra‑high settings in AAA games, but for esports titles and indie releases the value is undeniable. In a world where GPU prices dominate budgets, allocating funds to a capable yet cheap CPU like this one frees up cash for a better graphics card.

This FM2+ processor fits a narrow but well‑supported motherboard ecosystem that includes chipsets such as A85X, A75, and A55. Those boards provide essential features like USB 3.0, SATA 6 Gb/s, and optional overclocking knobs, even though the CPU itself is locked. Compatibility is straightforward: any socket FM2+ board will recognize the chip without BIOS updates, making upgrades painless for legacy systems.

The Intel Equivalent of Athlon X4 840

Looking for a similar processor from Intel? The Intel Core i5-4690K offers comparable performance and features in the Intel lineup.

Intel Core i5-4690K

Intel • 4 Cores

View Specs Compare

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